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3 years ago

When a chance mutation modifies a virus to attach to a new host species, it is called

Biology

1 answer:

strojnjashka [21]3 years ago

4 0

Answer:

gain-of-function

Explanation:

Gain-of-function mutations represent a type of genetic change that may confer a new function to the gene that undergoes the mutation. In this case, a gain-of-function mutation conferred to the virus an adaptive advantage by allowing it to encode a new protein which is capable of attaching to the cell membrane of a new host. In this regard, it is important to note that loss-of-function mutations are quite common in nature, while gain-of-function mutations are relatively rare.

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What are the differences between aggregate fruit and multiple fruit

Dmitry_Shevchenko [17]

Answer:

Aggregate fruit is a fruit that develops from several ovaries forming one flower. An example of an aggregate fruit is a raspberry. Multiple fruit is fruit that develops from a cluster of flowers, and each flower produces a fruit, which turns into a mass of a singular fruit. An example of multiple fruit is a pineapple. Each "cube" of a pineapple is a separate fruit formed from a single flower, yet the pineapple as a whole is one mass of pineapple.

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3 years ago

Studies peg the number of proteins in the human body to be around 10,000 to several billions. This diversity is a result of the

Harrizon [31]

Answer:

The correct answer is - option B.

Explanation:

The diversity of numbers of proteins in the human body is due to the differences in the structure of proteins. This change or difference in the structure of proteins is mainly affected by the sequence of amino acids.

The order of sequence of amino acid segment or residue in the peptide chain of the protein affects the structure of the particular protein which also leads to change in the secondary and tertiary structure of the protein.

Thus, the correct answer is - option B.

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3 years ago

Over time, the Earth's orbit becomes more or less elongated. This change in orbit, which is linked to past cooling trends, is ca

Yuri [45]

Milankovitch cycle, its named for the man who theorized it

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3 years ago

Read 2 more answers

If a pea plants alleles for height are tt what is true of it’s parents? Both parents were tall parents were short both parents c

makkiz [27]

Both parents contributed a recessive allele and were short.

7 0

3 years ago

A farmer plants Bt cotton that is genetically modified to produce its own insecticide. Of the cotton bollworms feeding on these

-Dominant- [34]

Answer:

the frequency of the resistant allele after one generation is 0.989

Explanation:

Given that :

A farmer plants Bt cotton that is genetically modified to produce its own insecticide.

Of the cotton bollworms feeding on these Bt plants, only 5% survive

i.e the survival rate s = 5% =0.05

unless they have at least one copy of the dominant resistance allele R that confers resistance to the Bt insecticide

Frequency of R allele = 0.01

In order to determine what will the frequency of the resistance allele be after one generation of cotton bollworms fed on Bt cotton; we need to first determine the frequency of the recessive allele r.

According to Hardy-Weinberg Equilibrium ;

p+q = 1

Let p = R and q = r

R + r = 1

0.01 + r = 1

r = 1 - 0.01

r = 0.99

Now; the frequency of the resistance allele after one generation can be calculated as :

$q' = \dfrac{q(1-sq)}{1-(sq^2)}$

where ;

q' = R

q = r

$q' = \dfrac{0.99(1-(0.05 \times 0.99))}{1-(0.05 \times 0.99^2)}$

$q' = \dfrac{0.99(0.9505)}{1-(0.049005)}$

$q' = \dfrac{0.940995}{0.950995}$

q' = 0.989

Thus; the frequency of the resistant allele after one generation is 0.989

3 0

3 years ago